The physical testing of rock for road building : including the methods used and the results obtained . PHYSICAL TESTING OF KOCK FOR ROAD BUILDING. 23 to the hammer. The reaction of the briquette after each blow of thehammer produces a vertical movement in the end of the lever L. Thismotion is recorded on a sheet of silicated paper wrapped around therecording drum M, by means of a brass point at the end of the lever revolution of the cam produces a slight motion of the drum,so that the drum makes a complete revolution in 100 revolutions ofthe cam. The number of blows necessary to destroy
The physical testing of rock for road building : including the methods used and the results obtained . PHYSICAL TESTING OF KOCK FOR ROAD BUILDING. 23 to the hammer. The reaction of the briquette after each blow of thehammer produces a vertical movement in the end of the lever L. Thismotion is recorded on a sheet of silicated paper wrapped around therecording drum M, by means of a brass point at the end of the lever revolution of the cam produces a slight motion of the drum,so that the drum makes a complete revolution in 100 revolutions ofthe cam. The number of blows necessary to destroy the resilienceof the briquette, so that no reaction is recorded on the drum, is takento be the cementing value of the material. (See fig. 20.) ADDENDUM. On page 23, following last paragraph under the headinginsert the following: Briquette machine,1 Five briquettes are made from each test sample and allowed todry 20 hours in air and 4 hours in a hot-air bath at 200° F. Aftercooling 20 minutes in a desiccator, they are tested by impact in amachine especially designed for the
Size: 1532px × 1630px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1910, bookyear1912
